Parts for your 2019 Nissan Serena-Throttle position sensors

2019 Nissan Serena throttle position sensors

Yes, the 2019 Nissan Serena (C27) uses throttle position sensors. Nissan’s factory service information for the C27 platform (Engine Control, Electronic Throttle Control section) specifies an electronically actuated throttle body that incorporates dual throttle position sensors (redundant tracks) to report throttle plate angle to the engine control module (ECM). The Nissan parts catalogue for the C27 series also lists the throttle position sensing as integrated within the throttle body assembly, and dealer diagnostics via CONSULT-III Plus provide live data for “Throttle Position Sensor 1/2,” confirming their presence on both MR20DD S-HYBRID and e-POWER variants.

On a 2019 Serena, the throttle position sensor (TPS) is there to tell the ECM exactly where the throttle plate sits, so the car can finely control air, fuelling, ignition timing and, where applicable, transmission behaviour. It also cross-checks against the accelerator pedal position sensors for safety. Because it’s an electronic throttle, the TPS is part of a closed-loop system that manages idle stability, quick tip-in response, cruise control and emissions. On e-POWER models, even though the engine primarily drives the generator, the ECM still uses TPS feedback to regulate engine load and speed smoothly and efficiently.

Servicing is straightforward but should be done carefully. The TPS is integrated into the throttle body and isn’t a separate, serviceable sensor. If the sensor fails or tracks go out of range, the usual fix is replacing the throttle body assembly. After any throttle body replacement, battery disconnection or thorough throttle cleaning, a throttle/idle relearn (Idle Air Volume Learn) is needed—best done with a suitable scan tool—to restore a stable idle. Avoid forcing the throttle plate open by hand, use appropriate throttle-body cleaner (safe for coated throttles) and keep the air filter and intake ducting in good nick to prevent contamination.

• Common symptoms of TPS issues: erratic idle, hesitation, poor fuel economy, cruise control dropping out, or limp-home mode.
• Likely fault codes: P0121, P0122, P0123, P2135 and related correlation errors between pedal and throttle.
• Good practice: inspect connectors and earths, keep the intake sealed, and schedule throttle cleaning during major services if deposits are evident.

Does the 2019 Nissan Serena actually have a TPS?

It does. The C27 Serena’s electronic throttle body houses dual TPS tracks, and values can be read in diagnostics as TPS 1 and TPS 2. This applies to both the 2.0-litre S-HYBRID and the e-POWER models.

Can the TPS be replaced on its own, or is it part of the throttle body?

It’s integrated. On these vehicles the TPS isn’t a stand-alone service item, the throttle body assembly is replaced as a unit. Allow around an hour for the job plus time for throttle/idle relearn. Pricing varies by market and brand of part.

What should be done after cleaning or replacing the throttle body?

Carry out a throttle/idle relearn so the ECM can reinitialise target airflow and idle control. Without the relearn, it may idle high, hunt or log correlation codes, especially after the battery has been disconnected.